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import java.util.*;
import java.util.Collections;
import java.util.Set;
import java.util.TreeSet;
public class MainClass {
public static void main(String args[]) throws Exception {
String elements[] = { "A", "C", "D", "G", "F" };
Set set = new TreeSet(Collections.reverseOrder());
for (int i = 0, n = elements.length; i < n; i++) {
set.add(elements[i]);
}
System.out.println(set);
}
}
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